Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf32e9b6a3b2def7…

MALICIOUS

PDF

77.1 KB Created: 2021-04-04 21:10:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 815755b76e042bae18e927f9946216a9 SHA-1: e763712062c24c356524cd4b6d1a59f02cfa5e30 SHA-256: cf32e9b6a3b2def702422bd2975df6be4b21879230c5e77dcff13b5e35fbc94d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a payload or redirect to a phishing site. The document body, though heavily obfuscated, contains text related to interview questions, serving as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://botokaw.ru/strik?utm_term=junior+database+administrator+interview+questions PDF link annotation
    • http://bometaximom.scienceontheweb.net/asset_allocation_portfolio.pdfIn PDF document text
    • https://sapurokegija.weebly.com/uploads/1/3/4/5/134577933/zilotudekaje-vetojafovid.pdfIn PDF document text
    • http://widaxaruko.mypressonline.com/28909264655.pdfIn PDF document text
    • https://pumelagu.weebly.com/uploads/1/3/2/8/132814433/junowidoni_jepeviz_dogil_viwojolavewob.pdfIn PDF document text
    • https://mudulavodeg.weebly.com/uploads/1/3/1/0/131070753/29fad5fd.pdfIn PDF document text
    • http://tofoxewesaxizuz.mywebcommunity.org/xutakutolixaponesuwafafa.pdfIn PDF document text
    • http://femetorisufi.sportsontheweb.net/gogebuzibenipa.pdfIn PDF document text
    • http://vubitim.sportsontheweb.net/mujekox.pdfIn PDF document text
    • http://bimizuzi.sportsontheweb.net/fokixoruvurivixadesegu.pdfIn PDF document text
    • http://wemuwetafivaxe.sportsontheweb.net/84112041607.pdfIn PDF document text
    • http://sunugukumota.getenjoyment.net/wizumunizabakerafexar.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://petojijoxura.onlinewebshop.net/demand_chain_management_theory.pdfIn PDF document text
    • http://wowutuzineko.myartsonline.com/nikon_d3300_costco_bundle.pdfIn PDF document text
    • http://wavanak.epizy.com/spatial_econometrics_methods_and_models_anselin.pdfIn PDF document text
    • http://sabasil.epizy.com/64481731005.pdfIn PDF document text
    • http://fipuxogililego.epizy.com/jedomefotikozu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aafa2258-9a7d-497f-8799-971bfec00987/sijusofafigejejidizak.pdfIn PDF document text
    • http://molugepunab.epizy.com/jurnal_adsorpsi.pdfIn PDF document text
    • http://dirulibas.onlinewebshop.net/37368038041.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/134e9e4a-99dd-41a3-a5b3-031a9ebf4427/advertising_and_promotion_an_integrated_marketing_communications_perspective_11th_edition_ebook.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6B 5344 bytes
SHA-256: b16b85abb623047bb226c36372a2a6b7038d374ef092eeb07e444ed2be04b2c2
font_01_sfnt_off00010192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10192 10948 bytes
SHA-256: ea76ca24fedf16cf08380a81f1205349230769a88a7119389c7d249b814668b6

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